SEISMIC BEHAVIOUR OF EXTERIOR BEAM-COLUMN JOINTS WITH SQUARE SPIRAL CONFINEMENT

This paper presents the seismic behavior of exterior beam-column joints with square spiral confinement in the joint region along with different reinforcement detailing for anchorage of beam bars, confinement in joint and additional reinforcement in beam and column. The performance of the specimens are compared in terms of lateral load-displacement hysteresis loop, load ratio, percent of initial stiffness versus displacement curves, total energy dissipation, beam rotation at distances of D and 2D, strain in beam main bars and crack pattern. Among all, the specimen with inclined bars from beam to column (named as SS2) was the most effective considering all the parameters taken for comparison. It is concluded that inclined bars from column to beam in SS2 can successfully move the plastic hinge away from the column face.